Mic does not work, outside of the windows.

Well i have a friend who got brand new PC, everything is working well except Mic.
That is a weird problem and i cant get hold on it, so i ask, if anyone does know how to fix it.
To the problem then, if he plugs in a mic then windows recognizes it, if he makes a test in windows speech recognition, it works (windows can hear) , in control panel- Sound- Recording that green bars are jumping (if open mic properties and under "listen" he checks "listen to this device" it also works) if he is speaking, if he makes a test call with skype, then it works (skype will play back) so it seems like everything works, But if he makes skype call or video with webcam then no sound goes through. in skype it does not matter if call is with or with out video, nor what mic is in use (webcam, headset or full external mic), also it does not matter if mic is plugged in front or back and webcam uses USB port.

Now i hope all understand that problem, does anyone know how to fix it, or what might cause that kind of a weird conundrum.

Thanks

Now pc info.

Windows 7 Professional 64-bit
System Manufacturer: MSI
System Model: MS-7918
BIOS: BIOS Date: 11/07/14 12:00:54 Ver: V2.5B0
Processor: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz (8 CPUs), ~4.4GHz

Sound Devices
-------------
Description: Speakers (Realtek High Definition Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_1462D918&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.7245 (English) (if trying to update then he gets message that "its up-to-date")
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 5/13/2014 13:09:48, 3962840 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No



Description: Realtek Digital Output (Realtek High Definition Audio)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_1462D918&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.7245 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 5/13/2014 13:09:48, 3962840 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No

i would try the first and most obvious and easiest thing first: uninstall skype and the webcam software that he is using; reboot to refresh everything; then reinstall those 2 programs and reboot again then test skype and the webcam software and see if it fixes the program. Sometimes what can happen is the program will get corrupted for one reason or another and the only real way to fix it is to uninstall and then reinstall. Also; something else to try if that doesnt work is to remove the mic from the device manager section of the control panel, do a scan for hardware changes, then hopefully windows will re detect and reinstall the driver(s) for the mic and maybe that will fix the issue.